21342863 has 8 divisors (see below), whose sum is σ = 21769440. Its totient is φ = 20918880.

The previous prime is 21342857. The next prime is 21342883. The reversal of 21342863 is 36824312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21342863 - 2⁶ = 21342799 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21342883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26381 + ... + 27177.

It is an arithmetic number, because the mean of its divisors is an integer number (2721180).

Almost surely, 2^21342863 is an apocalyptic number.

21342863 is a deficient number, since it is larger than the sum of its proper divisors (426577).

21342863 is an equidigital number, since it uses as much as digits as its factorization.

21342863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1297.

The product of its digits is 6912, while the sum is 29.

The square root of 21342863 is about 4619.8336550140. The cubic root of 21342863 is about 277.3858004790.

The spelling of 21342863 in words is "twenty-one million, three hundred forty-two thousand, eight hundred sixty-three".